hold: I would say a bit more hold due to the sweep of the fin, they feel more traditional when you wrap the board in the lip of a wave and come around during a cutty. I think slightly they have slightly longer arcs, and because of that, they hold their speed a bit better. The k2.1s I think pivoted so quickly that a lot of speed went into your direction change and putting water in the wait. Think of a patented slater pocket hack at snapper. Less lateral motion and more pivot, huge fan.

drive: yeah a little more drive, but that's to be expected with the increased sweep. have more of a traditional thruster feeling to them, easier to get a smooth bottom turn past a long section.

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If u love K2.1's u will also love Jw i think. Iv only had em in normal pu boards as my FW are futures. I reckon they are a fantastic fin, drive, looseness, controlled slide when u want it, sheez what more could u want! Me at 170lbs I feel like if I was too much heavier, they would be too loose. My son is 160 lbs advanced surfer and they look perfect for him. Also the wider the tail in the board, the less drive they have. Didnt go real good in my JS Black Box, lacked drive.

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arent they a bit bigger then the k's? i thought i read that they were in between the k's and the m5's.. i really like the k2.1s at 170.. they went so good the other day on my razor i'm just gonna stay with them

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The Jw back fin is smaller than the JW side fins, as is the K2.1 setup. If u ever get bored with the slaters, try the Julians next, I like em both as much as each other. According to the FCS site, Jw's side and centre fins are smaller than the side and centre of K2.1, but JW have more rake back {i think I read that right)

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Hey Chris so I Have Jw-1 and Mick Fannings for My New Hellrazor...Havn't Tried either One Yet. Have Loved My Blackstix JC-1's in My Hellfire... Im 5'11 165 and Surf Above average in Central Florida....what do You Suggest (FCS ON MY HELLRAZOR) Thankss Ill take any and all opinions also